不活性冷媒中での銅の腐食挙動

概要

論文の詳細を見る
Liquid perfluorocarbon coolant【O!R】 Fluorinert FC-72 for electronic devices has high thermal stability and low chemical reactivity. However, the presence of water in FC-72 at less than 10 wt ppm has been shown to appreciably increase copper corrosion. In the present study, the corrosion mechanism under low solubility of water in FC-72 was investigated by chemical analysis, water volume measurement, and corrosion testing. It was found that FC-72 liberates no decomposition products in temperatures below 100°C and copper corrosion depends on liquid temperature, dissolved water, and oxygen. In FC-72, copper specimens were corroded by wet oxidation at temperatures of 50, 70, and 85°C and by both wet and dry oxidation at 100°C. Copper corrosion was induced when dissolved water in FC-72 was increased to more than 8 wt ppm. However it was reduced when oxygen in FC-72 was decreased to less than 25ml/L. Dissolved water in FC-72, as in air, equilibrates with adsorped water on copper surface. Therefore, the mechanism of copper corrosion in FC-72 is the same as that in air. It is considered that the mechanism for FC-72 can be extended to explain corrosion behavior in almost all inert coolants.
社団法人日本材料学会の論文
1999-04-15